OPT is a common way for many students from China to stay in the United States after graduation. After the student visa expires, the applicant can use the legal status of OPT to find a suitable job while practicing, and then successfully convert the student visa into a work visa. The extension of the validity period of OPT for STEM students will enable foreign students in related fields to have more spare time to engage in part-time jobs related to their majors during their study abroad, which can effectively alleviate the economic pressure on their families while improving their professional level and accumulating practical experience.